EP4250481A1 - Antennenanordnungen für schwere nutzfahrzeuge - Google Patents

Antennenanordnungen für schwere nutzfahrzeuge Download PDF

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Publication number
EP4250481A1
EP4250481A1 EP22164007.1A EP22164007A EP4250481A1 EP 4250481 A1 EP4250481 A1 EP 4250481A1 EP 22164007 A EP22164007 A EP 22164007A EP 4250481 A1 EP4250481 A1 EP 4250481A1
Authority
EP
European Patent Office
Prior art keywords
heavy
vehicle unit
body structure
antenna elements
duty vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22164007.1A
Other languages
English (en)
French (fr)
Inventor
Johan Wettergren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo Truck Corp
Original Assignee
Volvo Truck Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volvo Truck Corp filed Critical Volvo Truck Corp
Priority to EP22164007.1A priority Critical patent/EP4250481A1/de
Priority to US18/180,371 priority patent/US20230307840A1/en
Publication of EP4250481A1 publication Critical patent/EP4250481A1/de
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
    • H01Q9/0435—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave using two feed points
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3216—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used where the road or rail vehicle is only used as transportation means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3266—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle using the mirror of the vehicle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction

Definitions

  • the present disclosure relates to antenna arrangements and radio systems for communication involving one or more heavy-duty vehicles such as semi-trailer vehicles and trucks.
  • the techniques disclosed herein can also be applied in other types of vehicles, e.g., in construction equipment and in passenger cars.
  • V2V vehicle-to-vehicle
  • V2I vehicle-to-infrastructure
  • IEEE 802.11p wireless communication system is an approved amendment to the IEEE 802.11 family of standards which adds wireless access in vehicular environments to the suite.
  • An emergency electronic brake light for example, is an automotive safety function where a vehicle informs nearby vehicles about the onset of a hard braking maneuver.
  • the communicated data is received, e.g., by vehicles to the rear of the braking vehicle, where it can be used to alert drivers of the event, or even for triggering automatic braking systems, thereby reducing the risk of collision.
  • a heavy-duty vehicle such as a truck or a semi-trailer vehicle normally comprises a large body structure which may shield radio transmission in some directions. Unless the antenna arrangement and its placement on the vehicle are both carefully designed, blockage can be experienced which is detrimental to communication system performance in one or more directions.
  • a heavy-duty vehicle unit such as a tractor or a trailer, comprising a body structure arranged to be supported on a horizontal ground surface by a plurality of wheels.
  • the body structure comprises a front surface, a top surface, and left and right side surfaces.
  • the front surface is arranged transversally to the ground surface and facing in a longitudinal direction of the vehicle unit
  • the left and right side surfaces are arranged transversally to the ground surface and facing in respective lateral directions of the vehicle unit
  • the top surface is arranged distally from the ground surface and transversal to the front surface and to the side surfaces.
  • the heavy-duty vehicle unit comprises one or more horizontally polarized antenna elements arranged extending out from the left and/or right side surface of the body structure.
  • the placement of the antenna elements on the side surfaces of the body structure implies that the radio transmission will not be blocked when communicating, e.g., in the rearward direction, which is an advantage. Also, since the antennas are horizontally polarized, the radio signals will not be attenuated in the same way that a vertically polarized radio signal would have been due to the propagation along the side surface. Thus, an antenna arrangement particularly suitable for communication in a longitudinal direction of the vehicle is provided.
  • At least one antenna element out of the one or more antenna elements is integrally formed with a side view mirror arranged extending out from the left and/or the right side surface.
  • One or more antenna elements may also be integrally formed with wing-formed object arranged extending out from the left and/or the right side surface. These antenna mountings are un-obtrusive, aerodynamically efficient, and also aesthetically pleasing.
  • One or more antenna elements can also be formed as a simple rod antenna arranged extending out from the left and/or from the right side surface, which is a design option that does not require much redesign of existing body structures.
  • the one or more horizontally polarized antenna elements form part of an antenna array also comprising one or more vertically polarized antenna elements arranged extending out from the top surface of the body structure.
  • This antenna array then becomes dual polarized, which means that diversity combining techniques are enabled.
  • the antenna array may for instance comprise a control unit and/or a radio transceiver arranged to select an antenna in the antenna array for communication with a remote radio transceiver.
  • the control unit and/or the radio transceiver can be arranged to combine a radio signal associated with the vertically polarized antenna elements with a radio signal associated with the horizontally polarized antenna elements, i.e., to implement some form of soft diversity combiner scheme.
  • control units radio transceivers, communication systems and vehicles, associated with the above discussed advantages.
  • Figure 1 illustrates an example heavy-duty vehicle 100, here in the form of a semi-trailer vehicle comprising a tractor 110 arranged to tow a trailer 120 via a fifth wheel connection in a known manner.
  • the vehicle 100 is associated with a longitudinal direction extending along the elongation direction of the vehicle, and a lateral direction that extends orthogonally to the longitudinal direction, as illustrated in Figure 1 .
  • the vehicle 100 comprises an antenna arrangement with two antennas 130 arranged extending out from the cab roof of the tractor 110, i.e., the top surface of the foremost vehicle unit.
  • These antennas can be used in V2X applications, for instance to communicate with other vehicles or with radio transceivers deployed throughout the traffic infrastructure.
  • the antennas can also be used to receive satellite positioning system signals that enable geographical positioning of the vehicle 100.
  • a vehicle unit forms part of an articulated or rigid heavy-duty vehicle. Examples of vehicle units comprise the tractor 110 and the trailer 120.
  • a rigid truck only comprises a single vehicle unit.
  • a dolly vehicle for attaching one or more secondary trailer vehicle units (not shown in Figure 1 ) is also considered a vehicle unit herein, and so are the one or more secondary trailers.
  • a vehicle unit comprises some form of chassis which supports a body structure on wheels.
  • a body structure of a vehicle unit can for instance be the cab of a tractor, or the compartment of a trailer.
  • the term body structure is to be interpreted broadly herein to comprise any form of physical structure arranged supported by the chassis of a vehicle unit.
  • the trailer unit 120 normally has a height h which exceeds that of the top surface on the tractor 110, communication with radio transceivers located to the rear of the vehicle 100 via the antennas 130 can be blocked or at least significantly attenuated, which reduces the communication performance.
  • a communication system using adaptive coding and modulation, such as the IEE 802.11p, would, if able to communicate at all, reduce its spectral efficiency to compensate for the loss in signal power due to the blockage, which means that the effective data rate of the communication is reduced.
  • ETSI EN 302 571 is a harmonized standard for radio communication in intelligent transport systems (ITS).
  • the standard primarily covers radiocommunications equipment operating in the 5855 MHz to 5925 MHz frequency band.
  • This standard does not stipulate any requirements when it comes to the polarization of the transmitted radio signals.
  • vertical polarization is used.
  • horizontal polarization would be an advantage.
  • polarization is seldom exact in the sense that a vertical polarization of an antenna is exactly normal to a horizontal plane. Rather, polarization is to be construed broadly as encompassing polarization which has its strongest component in the given direction. Thus, to be of horizontal polarization means that the polarization is essentially normal to a vertical plane, but not necessarily exactly normal. Vertical polarization is also to be construed as being essentially normal to a horizontal plane. For instance, a deviation below some 30 degrees between the actual polarization direction of an antenna and the indicated polarization plane can be considered acceptable.
  • Propagation along a metal surface is attenuated for parallel polarization, but not for perpendicular polarization.
  • vertical polarization is preferred since it is perpendicular to the roof surface (assuming the roof top is essentially horizontally aligned).
  • the cab is, as noted above, an example of a body structure and the roof top of the cab constitutes the top surface of the body structure. Putting V2X antennas on the roof top of the cab is not ideal because there is often a trailer or other form of vehicle unit body structure that is higher than the cab and which blocks out radiation in direction backwards from the vehicle.
  • Heavy-duty vehicles normally comprise large body structures which are prone to blocking radio signals in one or more directions.
  • the blockage can be caused by the body structure on the same vehicle unit where the antenna is mounted, and/or by a body structure on some other vehicle unit of the heavy-duty vehicle.
  • the antenna elements can be stand-alone antennas, such as rod antennas, or integrated in winglets, mirrors, or the like.
  • horizontal polarization at least for radiation backwards and forwards in the longitudinal direction of the vehicle, which are particularly important directions in future V2X systems.
  • a dual polarized antenna array system with vertically polarized antennas arranged on the body structure top surface and horizontally polarized antennas arranged protruding out from the side surfaces of the body structure of course brings additional advantages. The vertically polarized antennas and the horizontally polarized antennas can then be used selectively where appropriate, or combined.
  • the vehicle 100 in Figure 1 generally comprises two or more vehicle units 110, 120, each comprising a body structure 200 arranged to be supported on a horizontal ground surface 210 by a plurality of wheels 220.
  • the body structure 200 has a front surface 230, a top surface 240 as well as left and right side surfaces 250. These surfaces need not be flat nor parallel, rather, the concept of a body structure surface is to be broadly construed.
  • the roof of a cab is, for instance, an example of a top surface, while the cab sides (comprising the doors) are examples of side surfaces.
  • the front surface 230 is arranged transversally to the ground surface 210 and facing in a longitudinal direction of the vehicle unit 110, 120, the left and right side surfaces 250 are arranged transversally to the ground surface 210 and facing in respective lateral directions of the vehicle unit 110, 120, while the top surface 240 is arranged distally from the ground surface 210 and transversal to the front surface 230 and to the side surfaces 250.
  • the heavy-duty vehicle units discussed herein comprise one or more horizontally polarized antenna elements 140, 150, 160, 330a, 330b arranged extending out from the left and/or right side surface 250 of the body structure 200.
  • These horizontally polarized antennas allow communication parallel to the side surfaces without aforementioned unwanted attenuation of the radio signals, since a horizontally polarized signal is less attenuated when propagating along a vertical surface compared to a vertically polarized radio signal.
  • a further advantage of this type of antenna arrangement is that the radio signals can propagate more or less freely in the longitudinal direction of the vehicle 100, and particularly in the rearward direction.
  • An antenna element 140, 160 can, for instance, be integrally formed with a side view mirror 115 arranged extending out from the left and/or the right side surface 250, as illustrated in Figure 1 .
  • an antenna element can be integrally formed with wing-formed object, sometimes referred to as a winglet, arranged extending out from the left and/or the right side surface 250.
  • An antenna element formed as a protruding rod having the horizontal polarization has also been shown to yield good results, especially for communicating with vehicle to the rear of the vehicle 100, as would be the case in an emergency electronic brake light application of the herein disclosed antenna systems.
  • Figure 3 illustrates a front view of an example vehicle unit body structure 200.
  • the one or more horizontally polarized antenna elements 330a, 330b form part of an antenna array which also comprises one or more vertically polarized antenna elements 320a, 320b arranged extending out from the top surface 240 of the body structure 200.
  • This array antenna is a dual-polarized antenna array capable of emitting radio signals in both horizontal and/or vertical polarization. The vertical component of such signals is emitted or received along the more or less horizontal top surface 240 of the vehicle unit, while the horizontal signal component is emitted or received along the more or less vertical side surface of the vehicle unit. Neither signal experiences the unwanted attenuation from propagating along a plane.
  • a control unit 310a, 310b can be arranged in connection to the antenna elements, for instance in-between a radio transceiver 340 and the antenna elements.
  • This control unit 310a, 310b can advantageously be arranged to select an antenna in the antenna array for communication with a remote radio transceiver, or to weight radio signals of the two polarizations together during transmission and/or during reception in order to optimize communication via the antenna array.
  • the control unit 310a, 310b, or the radio transceiver 340 optionally implements a soft diversity combining signaling scheme where the radio signals received via the horizontal and vertical polarization receivers is combined in order to improve some performance criterion, such as received signal strength (RSS), signal-to-noise-ratio (SNR), or some other suitable performance criterion.
  • some performance criterion such as received signal strength (RSS), signal-to-noise-ratio (SNR), or some other suitable performance criterion.
  • RSS received signal strength
  • SNR signal-to-noise-ratio
  • MRC maximum-ratio combining
  • MRC is a method of diversity combining in which the signals from each polarization channel are added together, the gain of each channel is made proportional to the root-mean-squared signal level and inversely proportional to the mean square noise level in that channel.
  • Diversity transmission can also be employed using similar principles. In this case a radio signal can be transmitted using both polarization
  • the control unit 310a, 310b, or the radio transceiver 340 may also implement a hard switching type of diversity, where the most appropriate antenna out of the horizontally and vertically polarized antennas is selected for a given radio reception operation or radio transmission operation.
  • the criteria for selection can be, for instance, SNR or RSS, or some other performance metric such as bit-error-rate (BER).
  • BER bit-error-rate
  • Figure 4 illustrates an example V2X communication scenario 400 where a heavy-duty vehicle 100 communicates with a number of other vehicles 410, 420, 430 and also with fixed infrastructure 440.
  • the directions of communication differ, where some directions of communication 435 are blocked by the body structure of the trailer vehicle unit 120, while other directions of communication 415, 425 are clear line-of-sight (LOS).
  • LOS line-of-sight
  • a communication system comprising the antenna array discussed above, which has vertically polarized antenna elements mounted on a top surface of the vehicle and horizontally polarized antenna elements mounted on one or more side surfaces of the vehicle 100 can implement a diversity scheme of communication where either a suitable antenna polarization is selected for each communication direction 415, 425, 435, or where both polarizations are combined in, e.g., an MRC diversity combiner.
  • the control unit 310a, 310b or the radio transceiver 340 may obtain performance metrics such as RSS or SNR, and perform signal combining or signal switching based on the obtained metric.
  • FIGS 5A and 5B illustrate a simplified example.
  • the situation for communicating from the vehicle 100 in Figure 4 to the car 430 behind the vehicle is exemplified.
  • the body structure of the trailer vehicle unit 120 is blocking the signal path from the top surface of the tractor 110, which means that the received signal strength on the vertical polarization (V) is reduced compared to the signal strength of the horizontal polarization (H).
  • the control unit 310a, 310b, and/or the radio transceiver 340, implementing diversity combining will favor the horizontal polarization for communication with the car 430, e.g., during application of emergency electronic brake lights.
  • the direction of communication is instead clear LOS, and the polarizations are more or less equal in terms of signal strength.
  • the control unit 310a, 310b and/or the radio transceiver 340 can use both polarizations in a diversity combining scheme, or just select one of them.
  • the polarization used for communication at the vehicle 100 is matched to a polarization of the remote radio transceiver, i.e., the radio transceiver at one of the other vehicle 410, 420, 430 or the infrastructure transceiver 440.
  • the control unit 310a, 310b does not need to be aware of the actual antenna design at the remote end since the diversity performance metric will also reflect the antenna polarization at the remote transceiver.
  • FIG. 6 is a flow chart which illustrates a method that summarizes some of the above discussions. There is illustrated a method for radio communication involving a heavy-duty vehicle unit 110, 120 comprising a body structure 200 arranged to be supported on a horizontal ground surface 210 by a plurality of wheels 220.
  • the body structure 200 comprises a front surface 230, a top surface 240 and left and right side surfaces 250, where the front surface 230 is arranged transversally to the ground surface 210 and facing in a longitudinal direction of the vehicle unit 110, 120, where the left and right side surfaces 250 are arranged transversally to the ground surface 210 and facing in respective lateral directions of the vehicle unit 110, 120, and where the top surface 240 is arranged distally from the ground surface 210 and transversal to the front surface 230 and to the side surfaces 250.
  • the method comprises arranging S1 one or more horizontally polarized antenna elements 140, 150, 160, 330a, 330b extending out from the left and/or right side surface 250 of the body structure 200, and communicating S3 a radio signal via the one or more horizontally polarized antenna elements 140, 150, 160, 330a, 330b.
  • the method further comprises arranging S2 one or more vertically polarized antenna elements 130 extending out from the top surface 240 of the body structure 200, and performing S31 a radio signal diversity combining operation based on the one or more horizontally polarized antenna elements 140, 150, 160, 330a, 330b and the one or more vertically polarized antenna elements 130.
  • the radio signal diversity combining operation may, for instance, comprise a maximum ratio combining operation or a hard switching operation.
  • FIG. 7 schematically illustrates, in terms of a number of functional units, the components of a control unit such as the control units 310a, 310b, and the radio transceiver 340 according to embodiments of the discussions herein.
  • Processing circuitry 710 is provided using any combination of one or more of a suitable central processing unit CPU, multiprocessor, microcontroller, digital signal processor DSP, etc., capable of executing software instructions stored in a computer program product, e.g. in the form of a storage medium 730.
  • the processing circuitry 710 may further be provided as at least one application specific integrated circuit ASIC, or field programmable gate array FPGA.
  • the processing circuitry 710 is configured to cause the control unit or the radio transceiver to perform a set of operations, or steps, such as the methods discussed in connection to Figure 6 .
  • the storage medium 730 may store the set of operations
  • the processing circuitry 710 may be configured to retrieve the set of operations from the storage medium 730 to cause the control unit to perform the set of operations.
  • the set of operations may be provided as a set of executable instructions.
  • the processing circuitry 710 is thereby arranged to execute methods as herein disclosed.
  • the storage medium 730 may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the control unit 310a, 310b, 340 may further comprise an interface 720 for communications with at least one external device.
  • the interface 720 may comprise one or more transmitters and receivers, comprising analogue and digital components and a suitable number of ports for wireline or wireless communication.
  • the processing circuitry 710 controls the general operation of the control unit, e.g., by sending data and control signals to the interface 720 and the storage medium 730, by receiving data and reports from the interface 720, and by retrieving data and instructions from the storage medium 730.
  • Other components, as well as the related functionality, of the control node are omitted in order not to obscure the concepts presented herein.
  • Figure 8 illustrates a computer readable medium 810 carrying a computer program comprising program code means 820 for performing the methods illustrated in Figure 6 , when said program product is run on a computer.
  • the computer readable medium and the code means may together form a computer program product 800.

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radio Transmission System (AREA)
EP22164007.1A 2022-03-24 2022-03-24 Antennenanordnungen für schwere nutzfahrzeuge Pending EP4250481A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22164007.1A EP4250481A1 (de) 2022-03-24 2022-03-24 Antennenanordnungen für schwere nutzfahrzeuge
US18/180,371 US20230307840A1 (en) 2022-03-24 2023-03-08 Antenna arrangements for heavy-duty vehicles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22164007.1A EP4250481A1 (de) 2022-03-24 2022-03-24 Antennenanordnungen für schwere nutzfahrzeuge

Publications (1)

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EP4250481A1 true EP4250481A1 (de) 2023-09-27

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EP22164007.1A Pending EP4250481A1 (de) 2022-03-24 2022-03-24 Antennenanordnungen für schwere nutzfahrzeuge

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EP (1) EP4250481A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884796A2 (de) * 1997-06-11 1998-12-16 Matsushita Electric Industrial Co., Ltd. Antenne aus gebogenen oder gekrümmten Teilen eines linearen Leiters
US20200182963A1 (en) * 2018-12-11 2020-06-11 Waymo Llc Filtering Undesired Polarization of Signals Transmitted From A Chip To A Waveguide Unit
WO2021019200A1 (en) * 2019-07-31 2021-02-04 The Secretary Of State For Defence Vehicle antenna apparatus, method of use and manufacture
US20210063557A1 (en) * 2019-09-02 2021-03-04 Cub Elecparts Inc. Vehicle radar device and system thereof
SE2000168A1 (en) * 2020-09-17 2022-03-18 Saab Ab Wideband horizontally polarized antenna

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884796A2 (de) * 1997-06-11 1998-12-16 Matsushita Electric Industrial Co., Ltd. Antenne aus gebogenen oder gekrümmten Teilen eines linearen Leiters
US20200182963A1 (en) * 2018-12-11 2020-06-11 Waymo Llc Filtering Undesired Polarization of Signals Transmitted From A Chip To A Waveguide Unit
WO2021019200A1 (en) * 2019-07-31 2021-02-04 The Secretary Of State For Defence Vehicle antenna apparatus, method of use and manufacture
US20210063557A1 (en) * 2019-09-02 2021-03-04 Cub Elecparts Inc. Vehicle radar device and system thereof
SE2000168A1 (en) * 2020-09-17 2022-03-18 Saab Ab Wideband horizontally polarized antenna

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